Caherard, or Lios An Gharráin, in County Galway, belongs to that category. On the north-eastern end of a ridge, where you might reasonably expect to find the remains of a stone enclosure, there is nothing to see at all. No visible surface trace survives.

The site is known primarily because nineteenth-century cartographers recorded it. The first edition of the Ordnance Survey six-inch map, which captured the Irish landscape in remarkable detail during the 1830s, marked this as a circular enclosure approximately twenty-five metres in diameter. The name Caherard itself points to a likely origin: "caher" derives from the Irish "cathair", referring to a stone ringfort, a type of enclosed settlement common across the west of Ireland from the early medieval period onward. Ringforts typically served as farmsteads, their circular walls defining a protected domestic space. What form the enclosure at Lios An Gharráin took, and when it fell, is no longer legible from the landscape itself.